Improvement in valve-gear for steam-eng-ines



UNITED STATEs ATENT OFFICE.

FURMAN R. WI`LSON,OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN VALVE-GEAR FOR STEAM-ENGINES.

Specification forming part of Letters Patent No. 82,575, (latedSeptember 29, 1868.

To all whom fit may concern:

Be it known that I, FURMAN R. WILSON, of the city and-county ofPhiladelphia, State of Pennsylvania, have invented new and usefulimprovements in the manner of working the valves of the cylinders ofsteam stampingmills, and also the valves of other steam-cylin-i ders 5and I do hereby declare that the follow` ing is a full, clear, and exactdescription of the construction of the same, reference being had to theannexed drawings, forming part hereof,-y and to the letters of referencemarked thereon.

Figure l is a perspective view of a steam stamping-mill, with myimprovements added. Fig. 2 is a side view ofthe lever H H H.

The nature of my invention consists ot'a combination ofmecha-nism,workin g automatically, for operating the valves of twosteam-cylinders in such a manner as to produce an alternate motion tothe pistons-that is, when the piston of one cylinder is driven in onedirection, the piston of the other cylinder is driven in an oppositedirection.

To enable others skilled in the art to make and use my improvements, Iwill proceed to describe their construction and mode of operation.

A A are steam-cylinders secured in an upright position on the bed-plateB, being supported by the frame C. D D are the valve or steam chests. EE are the valve-rods, and are connected together at their outer ends. FF are the piston-rods or stamp-stems, and F F are the extensions of thepiston-rods or stampstems through the cylinders A A. G G are adjustablecams, by means of the screw-thread on the upper end ofthe piston-rods FF. H H H is the lever for moving or working the valves when -operated onby the cams G G, and is connected with the valve-rods E E. J is thelug-plate, bolted iirmly to the cylinderheads, for the purpose ofsupporting the fulcrum-pin K. L L are the stamps. M M are the dies forthe stamps to strike upon. O O are pipes for conveying off the exhauststeam. P P are the pipes for conveying the steam from the boiler to thecylinders.

The valves are of the style of the common slide-valve, and work overthree portstwo of them for induction or supply ports, the other for theexhaust or educton port-they being the same on each cylinder.

The ports for each cylinder that admit steam into the cylinders belowthe piston are on the outside or farthest from the stuffing-boxes thatthe valve-rods pass through. Consequently, to admit steam into thecylinders below the pistons, the valve rods would have to be drawn out.The ports for admitting steam into the cylinders above the pistons arenearest the sides of the chests that the valve-rod stuffingboxes are on.Therefore, to admit steam into the cylinders above the pistons, eachvalve-rod would have to be pushed in.

The lever H H His forvworking the valves, and is composed of 'two armson one side of the fulcrnin-pin and one arm on the other side. Theportion of the leverthrough which the fulcrum-pin passes may be termed ahub, and

Vis as long as the distance from the center of the piston-rods F F tothe center of the valverods E E. At the end of the hub that is oppositethe center of the piston-rods are the two arms, extending up from thehub and' spreading suiciently to come within the limits of theprojections on the cams G'G, that act as guides to keep the cams in theright positions, that the roller inside of the guides of the cams mayact on the bent or slanted portion of the lever.

The upper portions of the two arms are bent or slanted from each other,or bent or slanted over the ends of the pistou-rods F F suflicient togive the valves the required throw or motion, when the piston-rods F F',with the cams G G on them, are on their upward motion,

bringing the roller in the cam G in contact head, and has, equidistantfrom the cylinders, *I

two lugs or projections extending upward and sufficiently apart to admitthe hub of the lever longitudinally between the two. Thelugs have a holethrough them corresponding to the hole through the hub, for the purposeof placing the strong pin K for the fulcrum of the lever H H H.

Having described the construction of the mechanism of my invention, Iwill now describe the operation of the same, and, that it may be morereadily understood, I will designate one of the cylinders as the firstside and the other as the second side.

When the machine or mechanism is at rest, or rather when no steam isbeing admitted to the cylinders, the stamps are resting on the dies M M,and, as the stamp-stems are the piston-rods, therefore both pistons willbe at the lower ends of the cylinders.

For an illustration, I will suppose the last d piston that had steamabove it to force it down when the steam was turned off was the pistonof the cylinder of the second side. the lever H H H was pushed overtoward the first side, when the piston of the second side made its laststroke before the steam was turned off. Consequently, the induction orfeed port for supplying steam above the piston of the second side wasleft open, and the induction or feed port for supplying steam below thepiston ofthe first side was left open also. Now, in that position, ifsteam should be turned on, the piston of the rst side would rapidly ascend until the cam G of that side came in contact with the bent orslanted portion of the lever H H H, causing it to move toward the secondside sufficiently to move the valves to a reverse position, or rather tocut off the supply of steam below the piston of its own (first) side,and open the port for supplying steam above the piston of its own(first) side, causing the piston to be arrested or cushioned, and giveit the downward pressure.

Therefore While the position ofthe valve of the first side isbeingreversed, the valve-rods E E being connected causes the valve onthe second side to be reversed also. Therefore the supply-port 'foradmitting steam below the piston on the ing, it will come down with muchgreater velocity and finish its stroke before the cam on the rod of thepiston of the second side reaches the bent portion of the lever tocushion and reverse the position of the valves, when the piston of thesecond side begins to descend, and the piston of the first side beginsto ascend again, and so on alternately.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. The construction of the lever H H H in the manner substantially asdescribed, and for the purpose set forth.

2. The arrangement of the cams G G and lever H H H and fulcrum orlug-plate J with reference to the valve-rods E E.

FURMAN R. WILSON.

Witnesses JAs. C. MILLIGAN, CHARLES HAnMAs.

